Dipropyl phosphite was prepared form phosphorus thichloride and n-propyl alcohol then chlorinated O,O-dipropyl chlorohosphate, the yield over 90%.

• 三氯化磷与正丙醇合成亚磷酸二正丙酯再氯化成O,O-二正丙基磷酰氯，收率达到90%25。